Typewriting machine



' March 1 1927.

H. c. SHEPARD TYPEWRITING MACHINE Filed July 10, 1925 INVENTOR.

, ATTORNEY WITNESSES Patented Mar. 1, 1927.

v 1,619,546, UNITED STATES PATENT OFFICE.

HERBERT o. SHEPARD, or FRANKFORT, NEW YORK, AssIenoR To REMINGTON TYP WRITER COMPANY, OF ILION, NEW YORK, A coRroRArroN on NEW YO K.

TYPEWRITING MACHINE.

Application filed July 10, 1925.

My invention relates primarily to cylinder stop or platen detent mechanism co-operative with the line spacing ratchet wheel of a typewriting machine, and the principal object of my invention is to provide new and improved mechanism of the character stated.

To the above and other ends which will hereinafter appear, my invention consists in the features of construction, combinations of devices, and arrangements of parts hereinafter described and particularly pointed out in the claims.

The invention is applicable to various styles of typewriting machines, but the accompanying drawings show the preferred form of my invention applied to a N0. 12 Remington typewriting machine. In the drawings,

Figure 1 is a fragmentary vertical sectional view of the platen and platen frame of said machine with my invention applied thereto.

Figure 2 is a fragmentary enlarged horizontal sectional View of my improved detent mechanism.

Figure 3 is a perspective" view of said mechanism showing the parts separated for the sake of clearness, and

Figure 4 is a fragmentary vertical sec- 30 tional view taken on a plane indicated by the section line 1 in Figure 1 and looking in the direction of the arrow at said line.

The platen frame of the machine comprises end bars or plates 1 provided with rearward extensions 2 that are connected by a cross rod 3. Mounted in the end bars by means of axle portions 4 is a rotary platen or cylinder 5 connected with the right-hand end whereof is a linespace ratchet wheel 6. (lo-operative with the ratchet wheel is a line spacing pawl 7 pivoted at 8 on a carrier 9 which is adapted to swing or turn concentrically with the platen. Connected with the pawl is a hand actuated train of devlces 45 comprising a link 10 which is operative to cause the pawl 7 to engage with the ratchet wheel .6 and turn the platen through line space distances, as is common in the said- Remington machine.

Detent mechanism is provided to co-operate with the ratchet wheel 6 to arrestthe platen after it has been turned and to maintain it in the line space positions to which it is turned, said mechanism comprising a detentroll 11, My invention, While adaptable Serial No. 42,752.

to typewriter pivots of various sorts, primarily resides in new and improved means for supporting or mounting the detent roll.

Heretofore the roll has been mounted on a spring arm, the free end portion of which was formed with curves or depressions to form a seat for the pin or stud on which the roll turned, the end portions of the pin be ing seated in the depressions and prevented from displacement by an overlying piece that was riveted to the spring arm. The spring arm being made of tempered carbon steel was liable to breakage at the seat portions; and it was moreover difiicult to fix the pivot pin securely in place. My present invention overcomes these defects and otherwise improves, simplifies and cheapens the construction. In carrying out my invention I provide a supporting arm 12 of carbon steel and having the necessary amount of spring but being substantially straight and not having any sharp bends or curves. The rear end portion of the spring arm is formed with a rectangular slot indicated at 13 which receives from underneath a headed screw 14 that is threaded upward into a block 15. Said block is mounted on the frame rod 3 inside the right-hand extension 2 and is secured in fixed relationship to the platen frame by a headed screw 16 which passes through the extension 2 and is threaded into i the block forward of the rod 3. The slot 13 and screw 14 enable the arm 12 to be ad justably secured to the platen frame. At its free end the supporting or spring arm 12 is formed with an open-mouthed slot 17 thus providing parallel tongues 18. Behind the slot 17 is a rivet hole indicated at 17. The roll 11 is glass-hard as is the pin or stud in which it is mounted to turn. Said pin comprises a body or central portion 19 cylindri cal in form, and reduced projecting end por- .tions 20 which are flattened and are substantially of the thickness of the spring arm 12. The body portion 19 is of a length to fit into the slot 17 in such a Way that endwise movement of the pin or stud is prevented by the shoulders 21 formed between the body 19 and the end portions 20. The pin or stud 19, 20 is preferably secured in rigid relationship with the spring arm. The securing means in this; instance is. preferably in the the folds, when adjusted to final form, receives the end portion of the spring arm 12. The portions 20 of the pin or stud arealso received between the folds and abut against the connecting portions thereof. To accommodate the roll 11 the piece 22 is formed with an elongated slot indicated at 26, said slot being of substantially the same width as the slotwav 17. The end portions of the folded piece are provided with rivet holes 27 which are brought into register when the piece is adjusted or folded. These holes receive a rivet 28 which also passes through the hole 17 in the arm 12. Prior to adjustment the piece 22 is of course open flat or substantially unfolded.

In assembling the parts, the roll 11 is inserted in the slot 26, the pin 19., 20 is passed through the bearing opening 11 in the roll, the part 22 is folded over. and adjusted or spring arm 12, after which the rivet 28 is passed through its holes 27, and 17 ,the

end or ends of the rivet then being spread metal is not liable to breakage,

or upset to secure the piece or part 22 in rigid relationship to the arm 12. The part 22 being of soft material may readily be folded, bent and shaped as desired. The construction is such that it. preferably clamps down or pinches the flat end portions 20 of the pin and also holds the rear faces of these end portions against the free end of the arm 12; that is, against the ends of the tongues 18. Thus the pin is securely held so that no friction occurs on these reduced end portions, the friction of the roll 11, as it turns, being borne by the larger body portion 19. The part 22 being of soft and the construction is such that I am enabled to provide a glass-hard roll and bearing pin, together with a carbon steel supportingor spring arm, and to assemble these parts by the securing means comprising the lap or clamping piece of soft metal, or folded ele .ment 22, and the rivet 28, thus minimizing liability to breakage and providing a comparatively cheap and efficient mounting for the detent roll of the detent mech anism.

Various changes may be made without departing from my 7 invention.

Vihat I claim to be new and desir-e to secure by Letters Patent is v 1. In detent mechanism for typewriting machines, the combination of a supporting arm, a detent roller, a pivot piece comprising a barrel portion for the roller to turn on and flattened end portions, and means for rigidly securing the flattened end portions of the pivot piece to said supporting arm.

2. In detent mechanism for typewriting machines, the combination of a supporting arm, a detentroller, a pivot'piece therefor comprising a barrel portion for the roller fitted to the end portion of the a clamp for clamping the flattened end portions of the pivot piece fixedly to said sup porting arm.

8. In detent mechanism for typewriting machines, the combination of a supporting arm, a roller detent, and a folded piece detachably secured to said arm and adapted to hold the pivot of said roller detent in fixed relationship therewith,

4. In detent mechanism for typewriting machines, the combination of a spring arm, a roller detent, a pivot piece having projecting "ends, and a piece of soft metal adapted to be folded about the ends of the pivot piece and to be fixedly secured to said spring arm.

5. In detent mechanism for typewriting nachines, the combination of a supporting arm, a detent roll, a pivot pin therefor having reduced and flattened end portions, and a piece adapted to be folded about said end portions and riveted to one end of said arm. i

6. In detent mechanisnr for typewriting machines, the combination ofa spring arm, a detent roll, a pivot pin therefor having reduced and flattened end portions, a piece adapted to'be folded about said end portions, and a securing rivet, saidfolded piece embracing the end portion of said spring .arm between its folds, the rivet passing through both folds and said spring arm.

7. In detent mechanism for typewriting machines, the combination of a spring arm,

a detent roll, a pivot pin. having'reduced and flattened end portions, and a piece adapted to be folded about said end portions and riveted to. one end of said spring arm, said spring arm and said folded piece both being slotted toreceive the detent roll, said roll turning on the body of said pin.

8. In detent mechanism for typewriting machines, the combination of a spring arm, a detent roll, a pivot pin therefor having reduced and flattened end portions, and a piece adapted to be folded about said end portions and riveted to one end of said spring arm, the body portion of said pin fitting in a slot in said piece and forming shoulders with the reduced end portions, which shoulders cooperate with the sides of the slot to prevent endwise movement of the pin.

9. In detent mechanism for typewriting machines, the combination of a supporting arm, a detent roll, a pin or stud on which said roll bears, said pin having projecting end portions which are flattened to substantially the thickness of said arm, a piece adapted to be folded to embrace and clamp said flattened end portions and also said arm, and securing means for said folded piece, said end portions being completely covered, r

10. In a typewriting machine, the combilbs nation of a platen frame, a platen, a line spacing ratchet wheel connected with said platen, a detent roll co-operative with said ratchet Wheel, a pin or stud on which said roll is mounted, a supporting arm detachably secured to said platen frame, and a separate piece folded about the free end of said supporting arm and riveted thereto, the projecting portions of said pin being clamped within the fold of said piece, said piece being slotted at its fold to accommodate said roll.

11. In a typewriting machine, the combination of a platen frame, a platen, a line spacing ratchet Wheel connected with said platen, a detent roll co-operative With said ratchet Wheel, a stud on Which said roll is mounted, a supporting arm detachably secured to said platen frame, and a separate piece folded about the free end of said supporting arm and riveted thereto, the pro jecting portions of said stud being clamped within the fold of said piece, said supporting arm being of carbon steel, said detachable piece being of soft metal, and said roll and its pin being glass-hard.

12. In a typewriting machine, the combination of a platen frame,a platen, a line spacing ratchet wheel connected With said platen, a detent roll co-operative with said ratchet Wheel, a bearing part on which said roll turns, a spring arm secured near one of its ends to said platen frame, and means for fixedly securing said bearing part against the opposite end of said spring arm.

13. In a typewriting machine, the combination of a platen frame, a platen, a line spacing ratchet Wheel connected with said platen, a detent roll co-operativewith said ratchet wheel, a bearing part on which said roll turns, a spring arm secured near one of its ends to said platen frame, an adjustable piece of soft metal for clamping said bearing part against the outer free end of said spring arm, and means for securing said piece to said Spring arm.

14. In detent mechanism for typeWriting machines, the combination of a supporting arm forked at one end, a two-ply bifurcated holding device, a detent roll and a pivot piece therefor provided With a central barrel portion for the roll and flattened end portions, the said roll being arranged between the arms of the said bifurcated portion of said device and the flattened ends of the pivot being arranged between the tWo plies of said device; the forks of the said supporting arm being also arranged between the two plies of said holding device and said holding device being secured to said supporting arm with the free ends of the forks of the latter pressing against the inner edges of the flattened pivot portions causing the outer edges of the latter to press against the free ends of the bifurcated portions of the holding device whereby the pivot piece is prevented from bodily movement and also from turning.

Signed at Ilion, in the county of Herkimer and State of New York, this 7th day of July, A. D. 1925.

HERBERT C. SHEPARD. 

